Each spring more than half of America's birds flock to the Canadian Boreal forest to nest. There, tens of millions of birds -- as many as 500 breeding pairs per square mile of forests, lakes, river valleys, and wetlands -- spend the winter. Yet almost all the biggest oil companies are mining and drilling important Boreal forest and wetlands to access thick, low-grade petroleum. As much as an area the size of Florida is endangered. This December 2008 report from NRDC, The Pembina Institute and the Boreal Songbird Initiative describes how Canada and the United States must protect migratory birds and bird habitat from this new form of high-impact energy development.